COURSE of the MONTH

SQL Server 2014 license management when changing server

We own 4x 2 core licences for SQL Server 2014 on our servers.
We are planning to move to another provider very soon .
During the transition from our actual servers to our new ones, we will have to test the new environment, including our databases, while our aplications will still run on our actual servers. That will last mayne a few days.
How can we do that without buying other sql server licenses?
Is the installation of an evaluation version on the new servers the good solution for that period?
Thanks